I am chasing a rattle from the rear when I go over bumps. It goes away if I cover the brake pedal, or fully apply the brakes. The rear calipers can be wiggled a bit by hand, the 15mm bolts that hold the guide pins are tight. The mud shield is not lose, that is what it sounds like it could be. The wiggle sound like if couild be the source. The 12mm, 12 point bolts that hold the caliper on are tight aswell.

Question is how much tolerence should there be? Should the caliper move all? I imagine there needs to be some float in the system. If it is a sticky pin, is it just a matter of cleaning and greasing? Or should I track down a repalcement pin?

Strangely, I would swear the noise is from the drivers side, but the passenger side caliper has more play.

 

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I bought replacement caliper pins and installed them. there may have been some play on the passenger side, the pin had some wear.
when I got to the other side I saw the pad was missing a spring. Swapped the in board an outboard pad so the spring did not matter.

truck no longer rattles. Not sure if the fix was the pins or the pad. Either way a result.